I was able to successfully build a personal book—on Mac OS 10.13.6; Sorry, but I don't do Windows You may need to contact Customer Service, unless one of the Windows Super-techs—Dave Hooton, KS4J, etc happen to notice this thread.

When Building personal books, I will occasionally have an entire document fail to load, and the error message is, "error compiling resource."

I have already changed fonts, set headings, and sorted it as a "Commentary." What am I missing?

For clarification: you mean to say that the compiling fails, not that the document didn’t load. What happens when you restart the app and retry? Are you editing the document and rebuilding it consecutively? This warning happens frequently enough under those conditions